The thing about Valve is that it's okay to get hyped up, because from the entire time I started buying from Valve, about 10 years ago, they've delivered nothing but wonderful quality games. With the exception of Steam requiring you to be connected to the internet, they've also been very lenient when it comes to DRM. This is a good thing, I've never pirated a Valve game and never intend to.
I myself loved the first Portal, my only beef was what they said they were going to address. It's like a can of Vienna sausages, once you start to get into it, it ends, and you're left feeling very much alone and cake-less.
Call me a fanboy, but I think I'm gonna be one of those Pre-Order heretics you see so much of these days.